Sum of exponents in prime-power factorization of binomial(6n, 3n).

Terms

a(0) =0a(1) =3a(2) =5a(3) =6a(4) =7a(5) =11a(6) =11a(7) =12a(8) =13a(9) =14a(10) =15a(11) =16a(12) =15a(13) =19a(14) =20a(15) =21a(16) =22a(17) =23a(18) =23a(19) =22a(20) =25a(21) =29a(22) =25a(23) =29a(24) =28a(25) =31a(26) =32a(27) =30a(28) =31a(29) =34